<template>
  <section class="loginContainer">
      <div class="loginInner">
        <div class="login_header">
          <h2 class="login_logo">不送餐的外卖</h2>
          <div class="login_header_title">
            <a href="javascript:;" :class="{on: loginWay}" @click="loginWay=true">短信登录</a>
            <a href="javascript:;" :class="{on: !loginWay}" @click="loginWay=false">密码登录</a>
          </div>
        </div>
        <div class="login_content">
          <form @submit.prevent="login"><!-- 阻止form提交刷新页面行为 -->
            <div :class="{on: loginWay}">
              <section class="login_message">
                <input type="tel" maxlength="11" placeholder="手机号" v-model="phone">
                <button :disabled="!rightPhone" 
                  class="get_verification" 
                  :class="{right_phone: rightPhone}"
                  @click.prevent="getCode"
                >
                  {{computedTime > 0 ? `已发送(${computedTime}s)` : "获取验证码"}}
                </button>
              </section>
              <section class="login_verification">
                <input type="tel" maxlength="8" placeholder="验证码" v-model="code">
              </section>
              <section class="login_hint">
                温馨提示：未注册硅谷外卖帐号的手机号，登录时将自动注册，且代表已同意
                <a href="javascript:;">《用户服务协议》</a>
              </section>
            </div>
            <div :class="{on: !loginWay}">
              <section>
                <section class="login_message">
                  <input type="text" maxlength="11" placeholder="手机/邮箱/用户名" v-model="name">
                </section>
                <section class="login_verification">
                  <input type="text" maxlength="8" placeholder="密码" v-model="pwd" v-if="showPwd">
                  <input type="password" maxlength="8" placeholder="密码" v-model="pwd" v-else>
                  <div class="switch_button" :class="showPwd ? 'on' : 'off'" @click="showPwd = !showPwd">
                    <div class="switch_circle" :class="{right: showPwd}"></div>
                    <span class="switch_text">{{showPwd ? 'abc' : '...'}}</span>
                  </div>
                </section>
                <section class="login_message">
                  <input type="text" maxlength="11" placeholder="验证码" v-model="captcha">
                  <img class="get_verification" 
                    src="http://localhost:4000/captcha" 
                    alt="captcha" @click="getCaptcha"
                    ref="captcha"
                  >
                </section>
              </section>
            </div>
            <button class="login_submit">登录</button>
          </form>
          <a href="javascript:;" class="about_us">关于我们</a>
        </div>
        <a href="javascript:" class="go_back" @click="$router.back()"><!-- $router.back()就可以返回上一页 -->
          <i class="iconfont icon-jiantou2"></i>
        </a>
      </div>
      <AlertTip :alertText="alertText" v-show="showAlert" @closeTip="closeTip" />
    </section>
</template>

<script>
import AlertTip from "../../components/AlertTop/AlertTip"
import {reqSendCode, reqSmsLogin, reqPwdLogin} from "../../api"
export default {
  data() {
    return {
      loginWay: true, //true短信登录 false密码登录
      phone: "", //手机号
      computedTime: 0, //计时的时间
      showPwd: false, //是否显示密码
      code: '', //短信验证码
      name: "", //用户名
      pwd: '', //密码
      captcha: "", //图像验证码
      alertText: "", //提示文本
      showAlert: false, //是否显示提示框
    }
  },
  components: {
    AlertTip
  },
  computed: {
    rightPhone() {
      return /^1\d{10}/.test(this.phone)
    }
  },
  methods: {
    //异步获取短信验证码
    async getCode() {
      //如果当前没有计时，这个时间为0，就是没有计时
      if(!this.computedTime){
        // 启动倒计时
        this.computedTime = 30;
        this.inertvalId = setInterval(() => {
          this.computedTime --
          if(this.computedTime <= 0) {
            //停止计时
            clearInterval(this.inertvalId)
          }
        }, 1000)
      }
      //发送ajax请求（向指定手机号发送验证码短信）
      const result = await reqSendCode(this.phone) //返回的是promise，想得到结果要使用await
      if(result.code === 1) {
        //显示提升
        this.isShowAlert(result.msg)
        //停止倒计时
        if(this.computedTime) {
          this.computedTime = 0;
          clearInterval(this.inertvalId)
          this.inertvalId = null; //这一步做不做无所谓
        }
      }
    },
    //是否显示提示框函数
    isShowAlert(alertText) {
        this.showAlert = true;
        this.alertText = alertText;
    },
    //异步登录
    async login() {
      let result;
      //前台表单验证
      if(this.loginWay) { //短信登录
        const {rightPhone, phone, code} = this;
        if(!this.rightPhone) {
          // 手机号不正确
          this.isShowAlert("手机号不正确")
          return
        } else if(!/^\d{6}$/.test(code)) {
          // 验证码必须是6位数字
          this.isShowAlert("验证码必须是6位数字")
          return
        }
        //发送ajax请求短信登录
        result = await reqSmsLogin(phone, code);
      } else { 
        // 密码登录
        const {name, pwd, captcha} = this;
        if(!this.name) {
          // 必须指定用户名
          this.isShowAlert("必须指定用户名")
          return
        } else if(!this.pwd) {
          // 必须指定密码
          this.isShowAlert("必须指定密码")
          return
        } else if(!this.captcha) {
          // 验证码没有指定
          this.isShowAlert("验证码没有指定")
          return
        }
        //发送ajax请求密码登录
        result = await reqPwdLogin({name, pwd, captcha});
      }
      if(result.code === 0) {
          //成功
          const user = result.data;
          // 将user保存到vuex的state
          this.$store.dispatch("recordUser", user)
          // 跳转路由去个人中心界面
          this.$router.replace("/profile")
        } else {
          const msg = result.msg;
          //显示新的图片验证码
          this.getCaptcha()
          //显示警告弹窗
          this.isShowAlert(msg)
      }
      //不管成功或失败都要停止倒计时
      if(this.computedTime) {
        this.computedTime = 0;
        clearInterval(this.inertvalId)
        this.inertvalId = null; //这一步做不做无所谓
      }
    },
    // 关闭警告窗
    closeTip() {
      this.showAlert = false;
      this.alertText = "";
    },
    // 获取一个新的图片验证码
    getCaptcha() {
      this.$refs.captcha.src = "http://localhost:4000/captcha?time=" +Date.now()
    }
  }
};
</script>
<style lang="stylus" scoped>
@import "../../common/stylus/mixins.styl"
.loginContainer
      width 100%
      height 100%
      background #fff
      .loginInner
        padding-top 60px
        width 80%
        margin 0 auto
        .login_header
          .login_logo
            font-size 40px
            font-weight bold
            color #02a774
            text-align center
          .login_header_title
            padding-top 40px
            text-align center
            >a
              color #333
              font-size 14px
              padding-bottom 4px
              &:first-child
                margin-right 40px
              &.on
                color #02a774
                font-weight 700
                border-bottom 2px solid #02a774
        .login_content
          >form
            >div
              display none
              &.on
                display block
              input
                width 100%
                height 100%
                padding-left 10px
                box-sizing border-box
                border 1px solid #ddd
                border-radius 4px
                outline 0
                font 400 14px Arial
                &:focus
                  border 1px solid #02a774
              .login_message
                position relative
                margin-top 16px
                height 48px
                font-size 14px
                background #fff
                .get_verification
                  position absolute
                  top 50%
                  right 10px
                  transform translateY(-50%)
                  border 0
                  color #ccc
                  font-size 14px
                  background transparent
                  &.right_phone
                    color black
              .login_verification
                position relative
                margin-top 16px
                height 48px
                font-size 14px
                background #fff
                .switch_button
                  font-size 12px
                  border 1px solid #ddd
                  border-radius 8px
                  transition background-color .3s,border-color .3s
                  padding 0 6px
                  width 30px
                  height 16px
                  line-height 16px
                  color #fff
                  position absolute
                  top 50%
                  right 10px
                  transform translateY(-50%)
                  &.off
                    background #fff
                    .switch_text
                      float right
                      color #ddd
                  &.on
                    background #02a774
                  >.switch_circle
                    //transform translateX(27px)
                    position absolute
                    top -1px
                    left -1px
                    width 16px
                    height 16px
                    border 1px solid #ddd
                    border-radius 50%
                    background #fff
                    box-shadow 0 2px 4px 0 rgba(0,0,0,.1)
                    transition transform .3s
                    &.right
                      left 30px
              .login_hint
                margin-top 12px
                color #999
                font-size 14px
                line-height 20px
                >a
                  color #02a774
            .login_submit
              display block
              width 100%
              height 42px
              margin-top 30px
              border-radius 4px
              background #4cd96f
              color #fff
              text-align center
              font-size 16px
              line-height 42px
              border 0
          .about_us
            display block
            font-size 12px
            margin-top 20px
            text-align center
            color #999
        .go_back
          position absolute
          top 5px
          left 5px
          width 30px
          height 30px
          >.iconfont
            font-size 20px
            color #999
</style>